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SUMMARY:Fermi-surface and volume-collapse transitions in heavy fermions an
 d pnictide superconductors - Prof. Matthias Vojta\, University of Cologne
DTSTART:20090507T131500Z
DTEND:20090507T141500Z
UID:TALK13965@talks.cam.ac.uk
CONTACT:Dr Jonathan Keeling
DESCRIPTION:Quantum phase transitions in metals are often accompanied by n
 on-Fermi\nliquid behavior and the appearence of novel phases in the vicini
 ty of the\nquantum critical point. Among the interesting theoretical conce
 pts is that\nof an orbital-selective Mott transition\, equivalently a brea
 kdown of the\nKondo effect\, in two-band systems - such a transition is ac
 companied by a\ncritical Fermi surface. I will briefly review experimental
  indications for\nthe existence of such a transition in heavy-fermion meta
 ls\, and discuss\navailable theories and global phase diagrams. Additional
 ly\, I will\nconsider the influence of electron-lattice coupling\, which c
 an induce a\nquantum version of the Kondo volume collapse. Such a transiti
 on may be\npresent in the iron pnictide CaFe2As2.
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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